Expansion joint core



June 8, 1937-. R. R. ROBERTSON V 2,082,971

EXPANSION JOINT CORE Filed sept. 3o, 1935 2 sheets-sneu 1 June 8, 1937. R. R. ROBERTSON EXPANSION JOINT CORE Filed Sept. 30, 1935 2 Sheets-Sheet 2 sul Paiented.- June s; 193,7

UNITED -srATEs EXPANSION Jo'nv'r conn Robert R4, Robertson, Chicago, Ill., assignor' to The Translode Joint Company, Chicago, Ill., a corporation of Illinois Application september 30,1935, seriaiNo. 42,772

1ol claims.

'I'his invention relates to a concrete road joint and4 more particularly to a load transmission expans'ion joint wherein a base unit has supported thereon an' improved nonfe'xt'ruding asphalt core unit embodying the principles of this invention and includingv a, preformed asphalt ',ller provided with integral side ribs or beads and having provided in opposite sides thereof rows of staggered recesses or pockets both in the main body of the filler and in the upper -ilange portion thereof whereby the filler upon the expansion-'of road slabs on opposite sides of the core unit isadapted to be readily compressed allowingl the filler material to ll up the recesses or pockctsto obviate extruding of the material from the joint; The filler material after filling the 'recessesl'or pockets is permitted to extrude linto .grooves proyided in reinforcing channels forming parts of metal; plates which are'clamped against the opposite so sides of the recessed ller within ,the bounds o f 4the stop beads or 'ribs sides of the ller. n i It is ari object of this invention to provide an expansion joint including in combination a core unit comprising a preformed plastic iiller board having stop beads formedv on opposite sides thereof and also having rows of staggered pockets and Abosses formed 'on both sides of the plastic board. l d

vIt is also an object ofthis invention to provide -anexpansion joint,l road forming mechanism with -an improved precast plastic iller consisting of a board having recesses formed on both sides there.- of and also having integrally formed on opposite. sides of the board precast' ribs or beads which also have recesses or pockets formed therein for 4 the reception of concrete resulting from the pouring of concrete slabs-on opposite sides of the `joint. c

It is a further object of this invention to provide a concrete jointv forming device including a plastic core having groove forming plates seated on oppositesides thereof, said plastic core being provided with recesses'on opposite sides thereof with the size and number of'saidvrecesses being(v determined by the mam'mum degree of compres' sion for which the core is designed.

It is furthermore an object of this invention to provide aroad expansion joint with a precast 50 plasticiller having recesses in opposite sides. of

the main body portion thereof and valso having' i integrally formed on the opposite sides thereof stop ribs which together with the upper margin -of the ller .are provided with staggered recesses which project from opposite 5;, said rib recesses being'` provided for the reception view taken on line IV-IV of (CL iid-18) of concrete when concrete is poured on opposite Y sidesof the joint to form road slabs.

It is an important object of this invention to provide lan expansion joint mechanism for embedding in concrete to separate the concrete road slabs, said mechanism comprising a base for supporting groove forming plates on opposite sides of a preformedr plastic ller having stop ribs integrally cast on opposite sides thereof and furthermore havingstaggered recesses formed on both sides of the ller as well as in the upper margin of the ller and in the integral ribs forming a part thereof. vided with means for covering the recesses in the" main body and flange of the ller. leaving the recesses in the ribs exposed for the reception of concrete when concrete is poured on opposite sides of the filler to form road slabs.

Other and further important objects of thisinvention will bef apparent from the disclosures in the, specification and the accompanying drawings.

The invention (in trated in the ,drawings described.

On the drawings: a

Figure 1 is a transverse vertical section taken through an 4expansion-joint mechanism embedded between concrete road slabs and including an a preferred form) is and hereinafter'more fully improved preformed plastic filler provided with recesses and having integral preformed beads formed thereon, said iller having groove forming plates contacting opposite sides thereof.

Figure 2 is a similar sectional vievvl with the ller cap removed and illustrating the position of the lparts when the concrete road slabs have expanded to compress the plastic ller causing the filler material to ill in the recesses and par- :tially extrude into thegrooves formed by the side plates. y f

Figure 3.is `a fragmentary side elevation of the preformed plastic 'filler removed from the joint to disclose the preformed stop ribs and the rows of staggered recesses.

Figure'i is a fragmentary detailed sectional Figure 3. Figure 5 is a. fragmentary side view of one of the groove forming plates. f Y Figure 6 afragmentary side view of a modified form of plastic iiiler having lround recesses formed therein. n

Figuref'l is a fragmentaryperspective view of the upper plastic ller wherein the preformed ribs are provided withstaggered recesses and wherein the The precast ller is proportion of another modified form of v feo recesses as well as the body portion of the filler. `Figure 8 is a fragmentary side elevation of another modified form of plastic ller provided 5 with rows of recesses and projections and having closure plates ,secured to the sides of the ller and contacting said projections.

Figure 9 is a transverse vertical section taken on line IX-IX of Figure 8. 10 Figure 10 is a fragmentary horizontal section taken on line Xe-X of Figure 8.

Figure 11 is a vertical section of another modiiied form of plastic ller provided with transverse rib forming -piates formed of cork to'which 15 flatside plates are secured.

. Figure 12 is a fragmentary detail section taken on line XII- XII of Figure.11.

As shown on the drawings: Figures 1 and 2 illustrate a vertical sectional view. of an improved road expansion joint forming mechanism which is embedded between concrete road slabs I which are supported upon the road subgrade in the regular manner. `In the form of the device illustrated in Figures 1 to A'5 inclusive, the expansion joint is of the load transmission type including a load transmission base Junit which serves as a load transmitting medium between the adjacent slabs of the concrete road. In the present showing, the base unit comsolid base plate 2 constructed -of sheet metal or other suitable material. The` longitudinal mar# gins of the base plate 2 arebent upwardly and then inwardly, toward one another to form oppositely positioned guide channels 3. The guide j channels 3 of the base unit provideoppositely positioned guide grooves 4. The margins of the top plates of the guide channels 3 are bent upwardly and are cut away to provide spaced upwardly `projecting retaining, flanges 5. The retaining anges 5 on opposite sides of the-base unit are staggered with respect to one another. Notches are provided between theretaining anges 5 on each side of the base unit" to permit load ltransmitting anchor shoes or holders t'o be seated therein in proper spaced relation-for the support of a core unit hereinafter more fully described.

`The load transmitting mechanism associated -with the base unit consists of a` plurality of anchor` shoes or holders which are movably or shiftably engaged in the base section and are ar- "ranged longitudinally in offset orA staggered relation with respect to one another.` The anchorshoes or holders are of substantially identical construction and are arranged with the adjacent shoes reversed with respectto oneanother as clearly illustrated in Figure l. Each of the anchor shoes is constructed of metal and comprises an angle bar including a base flange 8 and -an upright ange or web 'I integral with said base iiange.- Struck outwardly from the upper margin of each of the flanges or webs 'I are anchoring blades or wings 8 leaving the inner side of the upright flange or web flat.

Supported on the basey iianges 6 of the anchor shoes between the upright flanges or webs 1 is a preformed plastic filler orv core board 9 constructed of asphalt or other suitable material.

. As clearly illustrated in Figure 3 each side of the thereon a longitudinally disposed rib or bead I Il positioned a short distance below the upper margin of the filler and having the ends thereof j terminating in the upper ends of vertical or end u ribs or beads II which are also preast'or-inprises an elongated base member consisting of a plastic filler or board 9 has precast or formed 2,082,977 upper margin of ythe ller is also provided withr tegrally formed on each side of the plastic ller a short distance from the end edges. The ribs I0 and II are provided to serve as stop members to prevent moisture and foreign matter from entering the main portion of. the expansion joint. Formed on each side of theupper portion of the plastic ller are staggered rows of small pockets or recesses I2 with the rows on each side of the filler being separated by the longitudinal stop ribs or beads II) as clearly illustrated jin Figure 3. Also provided in the opposite sides of thelmain l body portion of the plastic filler 9 are staggered rows of large pockets or recesses I3. The pockets or recesses I2 and I3 are provided in the preformed plastic ller 9 for the purpose of providing suficient space into which the 'material forming the filler may be squeezed when the plastic filler or core is compressed due to the expansion of the road slabs I. The size and number of the pockets or recesses are regulated or determined by the degree of compression to which the core board '9 is designed to be subjected, so that the maximum 'amount of compression 'may be applied to the core board without causing extrusion of the plastic material from the joint.

Engaged against each side of the main'body portion of the recessedplastic ller 9, within the frame formed by the precast ribs I IJ and Il, is a metal plate I4 the upper margin of which is deilected outwardly to form a top flange I5. The upper half of the plate I4 is deected to one side of the plate to form a channel I6 which is positioned a short distance below the top flange I5 and extends from end to end of the plate. The

plates I4 are projected downwardly between the side surfaces of the filler board 9 and the straight surfaces of the upright iianges or webs 'I of the anchor shoe, thereby holding the top ianges I5 of the'plate seated beneath the lower surfaces of the precast longitudinal ribs I0 as clearly iilustrated in Figure 1. 'Ihe groove forming metal plates positioned on opposite sides of the main body portion of the ller have thechannel members I6 thereof so positioned that they form covers for the upper rows of the pockets I3 and the lower rows of the smaller pockets I2. The lower straight portions of the plates I4 seat against the sides ofthe lower portion ofthe body of the lier to close the lower rows of the large pockets or recesses I3.

f After the plates I4 are engaged in position a channel-shaped metal cap I8 is removably engaged over the upper margin of the plastic iiller 9 allowing the longitudinal edges of the inverted cap I8 to seat upon the plastic ribsIII to hold the top of the cap I8 near the top surface of the concrete road to permit` proper rounding ofi' of the top edges of the slabs I. As clearly illust-rated in Figure l, the side flanges of the cap I8 close the upper rows of pockets or recesses I2 which are provided in the top margin of the lier 9. I

After the filler 9, the cap I8 and the side plates I4 are engaged in position supported by the anchor shoes, concrete is poured on opposite sides A the road slabs is sufficient.

:apesar:r

may be left open as formed or if necessar/y the groove may be partially filled up with asphalt or .the like.

When the concrete road slabs I are subjected to temperature increases, they expand toward one another thereby compressing the joint core unit and primarily the asphalt filler board 9 causing the material of the preformed asphalt ller to flow into the pockets or recesses I2 and I3 to substantially fill the same when the expansion of After the pockets I2 and I3 have been filled up as illustrated in Figure` 2, any further expansion of the road slabs will cause the plastic material of the filler to gradually flow into the grooves I1 thereby obviating the extrusion of the asphalt material from the joint. 'I'he channel portions I6 of the plate I4 not only are used to form the grooves I1 in the adjacent sides of the road slabs but said channel 20 members also act as reinforcing members for one another.

the plates I4 thereby permitting thin sheet metal to be used. When the concrete is poured to form the slabs I, the concrete is prevented from entering the ends of the grooves I1 by the preformed plastic end ribs Il against which the ends of the depressed channels I6 abut. Upon contraction of the road slabs from the positions illustrated in Figure 2, the concrete pulls away from the plastic filler and away from the channel portion of the metal plates I4. The shoulders, formed by the concrete slabs and which surround the rib portions I and II, upon contraction of the slabs are adapted to move outwardly with respect to the stop ribs thereby permitting saidstop ribs to act as stops for a filling which may be poured into the marginal spaces extending downwardly 4from the top of the slabs and inwardly from the ends of the joint. It will thus be noted that with the overlapping of the concrete shoulders with the plastic ribs lli and II that water and foreign materials are prevented from findingtheir way into the main portion of the expansion Joint.

Figure 6 illustrates a modified form of a precast circular pockets or recesses 23 which are arranged i above and below the horizontal ribs'20. The plastic filler I9 illustrated in Figure '6 is adapted to be used in the same manner asthe lier illustrated in Figure 3.

Figure 7 illustrates another modified form of plastic filler unit consisting of a plastic board 24 having integrally cast or formed on both sides near the upper edge thereof plastic ribs or beads 25. Each of the ribs 25 is provided with pockets or recesses 26 which are provided in the upper and lower surfaces of the ribs with the rows of pockets or recesses staggered. 'I'he main body portion of the filler board 24 is provided with staggered groups or rows of pockets or recesses 21 similar to the arrangement illustrated in both .Figures 3 and 6. The upper marginal portion of the filler vboard 24 `above the ribs 251s also provided with pockets or recesses 29 with the pockets on opposite sides of the top flange or margin of the board staggered with respect to 'Ihe opposite sides of the main body portion of the filler board 24 are adapted to be closed by means oi' metal plates 4ci' the type illustrated in Figure while the upper flange or margin of the filler board 24 is adapted to have a cap I3 engagedthereover to close the pockets or recesses 29. Attention is called to the fact thatthe staggered pockets or recesses 26 formed .be stretched and compressed with the contraction and expansion of the road slabs I.

Figures 8, 9 and 10 disclose a further modified form of a filler unit comprising a precast plastic board 29 having an integral upper flange 30 and integral end' flanges 3l. integrally formed between the upper ange 30 and the main board 29 are outwardly projecting upper ribs or beads 32. Side ribs or beads 33 separate the said flanges 3| from the board 29.

Formed in opposite sides of the plastic board 29 are staggered rows of sockets or recesses 34 which are formed by partially punching the board and forcing the punched material into forms or and alternate with one another in each row as clearly illustrated in Figure 8.

Engaged against each side of the plastic board 29, within the frame formedby the ribs 32 and 33,-is a metal plate 36 the upper margin of -which is deflected outwardly and then upwardly to form an angle comprising a shoulder 31 and a top flange 39 having openings therein for the reception of retaining nails 39. The upper portion of the plate 36 is formed with anV outwardly projecting channel which serves to reinforce the plate and provides a groove 4I. The plastic board 29 and the plates 36 are adapted to be mounted for use on a supporting base similar to the arrangement illustrated in Figure 1. The plates 36 have the upper anges 33 secured to the ribs 32 by nails 39 thereby permitting the plates 36 to seat against the bosses 35 which hold the plates spaced from the 'sides of the plastic board 29. A channel cap I8 is removably engaged over the plastic top ange 30 of the filler similar to the arrangement disclosed in Figure 1.

With the filler unit in position as described, concrete is poured on Opposite sides thereof to form road slabs I after which the cap I3 is removed. The groove resulting from the removal of the cap I9 may be left open to be filled later when the plastic top flange 30 is compressed due to the expansions of the road slabs I.

the end ribs 33 act to respectively close. the top' and the ends of the expansion joint to obviate the entrance of water and foreign materials into joint.

Figures 11 and 12 disclose an expansion joint core orl filler unit comprising a precast plastic board 42 having staggered rows of bosses or knobs 43 and sockets or recesses 44 formed on each side thereof. Seated upon the top edge of the board 42 is a cross board or strip 45constructed of cork or other suitable material. The 'cork strip 45 projects beyond both sides of the board 42 to form top ribs. Seated upon the top of the cork strip 45 is a -top ange or bar 46formed of plastic material. Both the flange 46 and the `cork strip 45 are secured to the top of the board 42 by nails 41 or the like.

Secured by means .of nails 41 to each end of the board- 42 is a cork side strip 48 and a plastic side flange 49. Metal side plates 50 are provided on the sides of the board 42 and seat against the bosses 43. The ends of the metal plates are nailed to the cork side strips 4B. Angle strips 5I are formed on the upper edges of the metal plates 50 and said angle strips t against the cork top strip'45 and are also secured thereto by nails 41 or the like. The cork top and end strips 45 and 48 serve to close the expansion joint spaces provided between the sides of the board 4.2 and the metal plates 50. y

It will ofcourse be understood that various details of construction may be varied through a wide range without departingfrom the principles of this invention and itis therefore `not the purpose tov limit the patent granted hereon otherwise than necessitated by'the scope of the appended claims.

I claim as my invention:

1. An expansion joint ller comprising a precast plastic board having staggered rows of recesses formed in` opposite sides thereof, and stop ribs integrally formed longitudinally and transversely on both sides of the board.

2, An expansion joint ller comprising a plastic board, having recesses formed in the opposite sides thereof, and rib members integrally formed on the opposite sides of the board with each of said rib members having recesses therein.

3. A non-extruding asphalt joint for embedding in concrete and including in combination a core unit comprising a preformed plastic filler board having recesses-therein to be lled'by the material forming the board when the board is com` pressed due to the expansin of the concrete, rib members integrally formed on the sides of the iiller board, and grooved plates positioned against the sides of the board and substantially surrounded by said rib members.

4. A non-extruding asphalt joint for embedding in concrete and including in combination a core unit comprising a preformed plastic iiller board having recesses therein to be filled bythe material forming the board when the board is compressed due to the expansion of the concrete.

groove forming plates contacting the sides of the board to provide grooves in the concerte for the reception of the material forming the board when the recesses have been illed, and'rib members integrally formed on the sides of the ller board and having recesses formedftherein for the reception of concrete to cause transverse stretching of the rib members when the concrete contracts.

5. An asphalt joint including in combination a ller unit comprising a precast plastic board having recesses in the opposite sides thereof 'with the recesses in one side staggered with respect to the recesses in the opposite side, and precast longitudinal and transverse ribs integrally formed on the sides of the ller board with said longitudinal ribs having upper and lower recesses therein with the upper recesses staggered with respect to the lower recesses.

6. A joint, forming mechanism including in combination a core-unit' comprising a preformed plastic iiller board having rib members cast on the sides thereof, said rib members having upper and lower recesses formed therein-with said upper recesses staggered with respect to the lower recesses 7. An expansion joint forming mechanism including in combination a core unit comprising a preformed plastic iillerboard having rib members cast thereon, said rib members having concrete receiving recesses Aformed therein to causetransverse stretching of the core unit with the contraction of the concrete slabs which bound the expansion joint.

8. An expansion joint filler comprising a precast plasticlboard having staggered rows of recesses formed therein, staggered rows of bosses integrally formed on said board with the bosses alternating with said recesses, ribs projecting from ythe sides of said board, and plates seated against the bosses and secured to said ribs.

9. A non-extruding asphalt joint for embedding inconcrete and including in combination a core unit comprising a preformedplastic board having recesses formed therein, bosses formed on said board, cork strips secured to edges of the board and projecting beyond the sides of the board, plastic ange members secured to the cork strips, and plates seated on said bosses and secured to the cork strips.

y 10. An expansion joint forming mechanism including .in combination a plastic board,I bosses punched outwardly from opposite sides of the board leaving recesses inropposite sides of said board opposite said bosses, ribs projecting from opposite sides of the board, and plates secured to said ribs and contacting theA bosses. f

` ROBERT R. ROBERTSON. 

